* refactor(transcript): reuse taskMessageToPayload in WS broadcast
The ReportTaskMessages WebSocket broadcast hand-built the payload and
duplicated the created_at formatting that taskMessageToPayload already
does. Reuse the helper with the just-inserted row, which carries the
same redacted values and the DB-assigned timestamp.
Co-authored-by: multica-agent <github@multica.ai>
* test(transcript): cover coalesce created_at behavior
Lock in that coalescing streaming fragments carries the latest
created_at, and falls back to the previous timestamp when the merged
fragment has none.
Co-authored-by: multica-agent <github@multica.ai>
---------
Co-authored-by: J <j@multica.ai>
Co-authored-by: multica-agent <github@multica.ai>
